CVE-2026-34121
Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS and C210
An authentication bypass vulnerability within the HTTP handling of the DS configuration service in TP-Link Tapo C520WS v2.6 and C210 v3 was identified, due to inconsistent parsing and authorization logic in JSON requests during authentication check. An unauthenticated attacker can append an authentication-exempt action to a request containing privileged DS do actions, bypassing authorization checks. Successful exploitation allows unauthenticated execution of restricted configuration actions, which may result in unauthorized modification of device state.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: TPLinkFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: TPLinkFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: TPLinkAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Tapo C520WS v2.6 TP-Link Systems Inc. |
≥ 0; < 1.2.4 Build 260326 Rel.24666n (affected, custom)
Other versions: unaffected |
CNA: TPLink |
| Tapo C210 v3.6 TP Link Systems Inc. |
≥ 0; < 1.2.7 Build 260818 Rel.64715n (affected, custom)
Other versions: unaffected |
CNA: TPLink |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 8.7 high |
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | CNA: TPLink |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-NotesCNA: TPLink · patch
- https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-NotesCNA: TPLink · patch
- https://www.tp-link.com/us/support/faq/5047/CNA: TPLink · vendor-advisory
- https://www.tp-link.com/us/support/download/tapo-c210/v3.60/#Firmware-Release-NotesCNA: TPLink · patch
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